Typomorphism of hypogene accessory minerals of the Vymsky horst structure (Middle Timan). Olivine, pyropes

The results of mineralogical study of pyropes and olivine from the Vymskaya horst-anticline structure (Kyvvozh goldbearing placer field, Middle Timan), that found during the heavy mineral concentrate sampling, are presented. Optical microscopy, electron microprobe, and scanning electron microscope were used in the research. High preservation of the endogenous surface of some pyrope individuals and olivine is demonstrated, indicating the closeness of their magmatic sources. The studied pyrope garnets belong to the lherzolite paragenesis of mantle minerals. Microinclusions of chrome spinels and orthopyroxene (enstatite) were found in some garnet grains. Abundant microinclusions of the high-pressure and high-temperature titanium-zirconium mineral srilankite (the first find on Timan) were found in one pyrope individual from the headstream of Belaya Kedva river. Investigated pyropes are characterized by compositions, which are identical to the ones for pyrope garnets from Umba kimberlite field (Middle Timan). It seems that magmatic rocks from the Umba pipes field are analogues of parent rock sources of pyropes from Kyvvozh goldbearing area and (or) themselves are sources for these pyropes.